| Reading ASCII [message #4706] |
Fri, 21 July 1995 00:00  |
dean
Messages: 55
Registered: March 1993
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Member |
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I am attempting to read a ASCII text file with topography data.
This file was created on a DOS machine and has a CR and NL character
after each line. In my attempts to read this file, I keep getting
the CR and NL characters which messes up my image. Is there a
way to read this file without picking up the CR and NL with IDL?
Below is the sample PRO I am working with. The ASCII file
is located on castor.cira.colostate.edu in Dean.
Kelly Dean
CSU/CIRA
============================================================ ====
PRO READ_TOP
imgname = 'elev.txt'
xsize = 961
ysize = 601
openr, unit, imgname, /get_lun
status = FStat(unit)
HELP, status, /STRUCT
image = INTarr(xsize, ysize)
scan = INTarr(xsize)
FOR j = 0, ysize-1 DO BEGIN
readU, unit, scan
image(0,(ysize-1)-j) = scan
ENDFOR
close, unit
free_lun, unit
nmax = MAX(image)
nmin = MIN(image)
print, ' MAX ',nmax,' Min ',nmin
WINDOW, 0, xsize=xsize,ysize=ysize,title='Elevation'
TVscl, image
end
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| Re: Reading ASCII [message #4777 is a reply to message #4706] |
Thu, 27 July 1995 00:00  |
dean
Messages: 55
Registered: March 1993
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Member |
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Thanks for the input people. It appears I cannot use IDL to read pass
the CR and NL. The c program that Amara Graps should be helpful. Unfortunely,
I don't have access to a UNIX box - just a Window NT or VAX/VMS.
Thanks again for the input,
Kelly
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| Re: Reading ASCII [message #4798 is a reply to message #4706] |
Sun, 23 July 1995 00:00 |
gennari
Messages: 25
Registered: April 1994
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Junior Member |
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dean@phobos.cira.colostate.edu wrote:
: I am attempting to read a ASCII text file with topography data.
: This file was created on a DOS machine and has a CR and NL character
: after each line. In my attempts to read this file, I keep getting
: the CR and NL characters which messes up my image. Is there a
: way to read this file without picking up the CR and NL with IDL?
:
: Below is the sample PRO I am working with. The ASCII file
: is located on castor.cira.colostate.edu in Dean.
:
: Kelly Dean
: CSU/CIRA
:
If your using this data file on a Unix machice you can easily
convert it using a standard text converter.
SGI: to_unix
SUN Solaris 2.x : dos2unix
or use apropos on your system to see what's available, i.e.,
apropos "convert text"
I used the SGI utility to_unix and got a clean image from your data.
This solution seemed easier than converting the ASCII data within IDL.
Scott Gennari
--
------------------------------------------------------------ ------
University of Hawaii voice (808) 956 5392
Dept. of Information & Computer Sciences fax (808) 956 9399
2565 The Mall, Keller 304A
Honolulu, HI 96822 email gennari@Hawaii.Edu
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| Re: Reading ASCII [message #4799 is a reply to message #4706] |
Sun, 23 July 1995 00:00 |
Mark Hadfield
Messages: 783
Registered: May 1995
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Senior Member |
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dean@phobos.cira.colostate.edu wrote:
>
> I am attempting to read a ASCII text file with topography data.
> This file was created on a DOS machine and has a CR and NL character
> after each line. In my attempts to read this file, I keep getting
> the CR and NL characters which messes up my image. Is there a
> way to read this file without picking up the CR and NL with IDL?
>
> Below is the sample PRO I am working with. The ASCII file
> is located on castor.cira.colostate.edu in Dean.
>
> ... Snip
>
> FOR j = 0, ysize-1 DO BEGIN
> readU, unit, scan
> image(0,(ysize-1)-j) = scan
> ENDFOR
Pardon me if I'm being obtuse, but why are you using an unformatted read
(READU) on an ASCII file?
IDL for Windows (and maybe other versions as well) eccepts either CR+LF or
LF-only as line terminators in ASCII files.
--
============================================================ ==
Mark Hadfield hadfield@storm.greta.cri.nz
NIWA (Taihoro Nukurangi) NIWA.GRETA:HADFIELD
Wellington, New Zealand
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